Video Sequence not fully loading in video editor
I faced the same issue just now. You should use ffmpeg to re-encode the video, specifying a bitrate and forcing frames to be duplicated. This worked for me:

ffmpeg -i input.mp4 -c:v libx264 -preset ultrafast -crf 0 -c:a copy -r 30 -vsync cfr output.mp4


This will generate a huge file because it's not compressing the video at all; if space is an issue, you can play with the -cfr parameter, bringing it to 20 or so (higher numbers mean more compression).